whats the difference between oomo 30 and moldstar ?

OOMOO 30 has a Shore hardness rating of 00-30, which is about as squishy as a gel shoe insert. Moldstar 30 is a hardness of Shore A-30, which is closer to pencil eraser hardness. It’s confusing, but there are 2 Shore hardness scales and a 30 on one is very different from a 30 on the other. In the description when it talks about hardness, pay attention to whether it says Shore A or Shore 00.

What color is this silicone? Can I use mica powders to color it

It is blue when mixed, and very opaque, so I doubt powders will be able to color it much if at all. If you're looking to label your molds, I've 3D printed mirrored text using a raft, and set it into the mixed material. It floats, and pulls away cleanly once the material is cured. If you want a platinum cure 2 part silicone around shore-A 30 you can color, I might suggest DragonSkin 30 or Platsil Gel-25.

Hi. i've made a wax mold of a small animal bone using this silicone method. i'm curious if i can use clay as well. i'm looking to make jewelry..

On Smooth On's website it states that this line of mold will not work with modeling clays that contain sulfur. Their website was very helpful and has lots of information: http://www.smooth-on.com/Silicone-Rubber-an/c2_1115_1341/index.html

No. Smooth On does however make a food safe silicone called Smooth -Sil 940

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🔥 Mold your masterpiece with confidence—durability meets precision!

NO VACUUM NEEDED - Skip expensive equipment—just mix and pour for professional results
EFFORTLESS MIXING - 1:1 mix ratio with 45-minute pot life means less hassle, more creativity
HIGH HEAT TOLERANCE - Withstands up to 450°F, perfect for low-temp metal casting and more
LONG LASTING DURABILITY - Tear resistant silicone ensures your molds stay reliable project after project
VERSATILE CASTING COMPATIBILITY - Ideal for wax, gypsum, resins, concrete, and low-temp alloys

Smooth-On Mold Star 30 is a platinum silicone rubber that cures to a tear-resistant, heat-resistant (up to 450°F) mold with a Shore hardness of 30A. It features a simple 1:1 mix ratio, 45-minute pot life, and 6-hour cure time, making it ideal for casting wax, gypsum, resins, concrete, and low-temperature metal alloys without the need for vacuum degassing.

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Brand	Smooth-On
Model Number	moldstar30
Color	Blue
Product Dimensions	19.1 x 15.19 x 7.59 cm; 590 g
Material	Silicone
Special Features	Heat Resistant
Item Weight	590 g

Smooth-OnMold Star 30 Silicone Mold Making Rubber - Trial Unit

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